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United States Patent | 5,230,769 |
Jancic ,   et al. | July 27, 1993 |
A process is provided for the separation of substances by melt crystallization. The organic mixtures which are difficult to crystallize are heated to a temperature sufficient to obtain a melt with the melt then being moved through a three-dimensional crystallization matrix having a large specific area. The melt is slowly cooled over a temperature range so as to achieve a selective crystallization from the supersaturated melt in the carrier matrix. A deposited crystal phase is thereafter melted and separated from the carrier matrix and removed by centrifugation. The carrier matrix may have a crystallization-promoting microstructure surface and may consist of an openpored foam.
Inventors: | Jancic; Slobodan (Lugano, CH); Sakellariou; Evangelos (Zurich, CH) |
Assignee: | Sulzer Brothers Limited (Winterthur, CH) |
Appl. No.: | 805325 |
Filed: | December 10, 1991 |
Dec 21, 1990[CH] | 04109/90 |
Current U.S. Class: | 62/532; 23/295R; 23/296; 23/299; 23/308R; 62/124; 422/245.1; 422/251 |
Intern'l Class: | C30B 015/00 |
Field of Search: | 156/600,608,619.1,624,DIG. 113 23/295 R,296,299,308 R 422/251 |
2450235 | Sep., 1948 | Gee | 23/296. |
2620263 | Dec., 1952 | Macklin | 23/296. |
2891099 | Jun., 1959 | Skinner | 23/296. |
3384459 | May., 1968 | Carter et al. | 23/296. |
3428437 | Feb., 1969 | Anderson | 156/600. |
3933573 | Jan., 1976 | Dagger | 23/296. |
3962082 | Jun., 1976 | Hundal | 210/71. |
4893792 | Jan., 1990 | Nemoto et al. | 266/227. |
Foreign Patent Documents | |||
2273567 | Jan., 1976 | FR. |